东仁沟油区延10油层组沉积微相研究

Research on Sedimentary Microfacies of Yan10 Formation in Dongrengou Oil Field

以区域沉积背景为基础,通过岩心观察与描述,建立岩电关系,充分利用测井资料并结合区域地质资料进行综合研究。由单井相到相剖面,再到沉积微相的平面展布,按照由点到线再到面的步骤进行沉积微相的划分。研究表明,东仁沟区延10油层组属曲流河相沉积,区内主要发育河床、堤岸、河漫3种亚相,进一步划分为天然堤、河漫滩等微相类型。顺物源方向,分流河道砂体连续分布。长1期以三角洲平原分流间湾、分流间沼泽沉积为主,局部夹小型分流河道、决口扇沉积。垂直物源方向,分流河道砂体连续分布,向西北方向呈逐渐变薄的趋势,纵向上,分流河道砂体之间被分流间湾泥岩、粉砂质泥岩分隔,局部发育决口扇、分流间沼泽微相沉积。

Based on the regional sedimentary background, through core observation and description, rock-electricity relation was established, and the comprehensive research was carried out by making full use of comprehensive logging data and regional geological data. Division of sedimentary microfacies was carried out by the steps of point to line to plane. Research shows that Yan10 reservoir in Dongrengou oil field belongs to meandering river deposition, mainly developed three subfacies of river bed, river bank and river flood, which can be further divided into natural levee, flood land microfacies types, and so on. Along the source direction, distribution of distributary channel sand body is continuous.Chang1 period is given priority to swamps deposition, local small distributary channel, crevasse splay sediment. Along continuous vertical source direction, distributary channel sand body distribution is continuous, gradually thinning in the northwest. The distributary channel sand body is divided by mudstone and silty mudstone, locally developed crevasse splay, micro swamp facies.